Breakdown of Дедушка тяжело сел на табуретку.
на
on, at / by (transport) / to (a place) / to (in answer to)
дедушка
grandfather
тяжело
hard / heavily
сесть
to sit down
табуретка
stool
Elon.io is an online learning platform
We have an entire course teaching Russian grammar and vocabulary.